Lifting-jack



PATENT QEEICE.

ALEXANDER T. WILSON, 0F FAIRFIELD, ILLINOIS. i

LlFTlNG-JACK.

l SPECIFICATION forming part of Letters Patent NO. 249,436, dated November 8, 1881.

Application Bled September 10, 1881. (Model.)

y of Fairfield, in the county of Wayne and State of Illinois, have invented a new and valuable Improvementin Lifting-Jacks; and I do hereby declare that the followin gis afull, clear, and exact description Oi' the construction and operation Of the same, reference being had to the annexed drawings, making a part of this speciiication, and to the letters and figures of reference marked thereon. v

Figure l Ot' the drawings isa representation Of a vertical section of my improved liftingjack, and Fig. 2 is a front view.

This invention has relation to lifting-jacks; and it consists in the novel construction and arrangement of a vertical slide working in Ways in the uprights Of the jack, and provided with a hinged top block, and a cam-lever for operating said slide, as will be hereinafter fully described,and pointed out in the claim.

Referring by letter to the accompanying drawings, A designates the base Of the jack, from which two uprights, B C, having interior ways, D, rise vertically. Between these uprights B C an eccentric or lcam lever, D', is pivoted by a headed bolt, E, passing through the uprights and cam-lever, a nut, I", being employed to secure the bolt E in place. A lifting-slide, G, works in the ways D, and is bifurcated at its lower end to straddle the cam portion ofthe lever D. hinged to this liftingslide, as shown, which may be turned back tO shorten the slide, or

may rest upon the top of the under section, and thereby lengthen the lifting-slide, as may be desired in use. The upper face-of the cam portion of the lever D is covered by a metal plate, I, to lessen thefriction and prevent wear on the cam.

Theoperation of the invention will be plain from the foregoing description, taken in connection with the drawings.

Having thus fully described my invention, whatI claim as new, and desire to secure by Letters Patent, is y In a lifting-jack, the combination, with the uprights B C, having ways D, and the pivoted cam-lever D of the lifting-slide Working in the Ways D, and having the hinged top section, u

H, substantially as and for the purposes specitied.

A'top section, H, is

In testimony that I claim the above I have hereunto subscribed my name in the'presence` `Witnesses:

S. J. GEORGE, GEO. C. WILOOX. 

